\begin{tikzpicture}
    \pgfmathsetmacro{\r}{1.3}
    \tkzDefPoints{0/0/B, \r/0/P, 2*\r/0/Q, 3*\r/0/C}
    \tkzInterCC[R](P,\r)(Q,\r)  \tkzGetFirstPoint{A}

    \tkzDrawSegments(A,B  A,C  A,P  A,Q  B,C)
    \tkzLabelPoints[above](A)
    \tkzLabelPoints[below](B,C,P,Q)
\end{tikzpicture}

